---Do you think it is _______ useful book?
---Yes. I got _______ “A” in my writing exam last week after I read the book.
| A．an; the | B．a; an |
| C．the; a | D．an; a |
— Must they clean and tidy the classroom now?
— No, they . It after school in the afternoon.
| A．mustn’t; must clean | B．needn’t; must clean |
| C．mustn’t; need be cleaned | D．don’t have to; can be cleaned |
— Oh, Miss Wei. Your skirt looks nice. Is it new?
— No, I it since three years ago.
| A．had | B．bought | C．have had | D．have bought |
— Has Li Hong gone to the library?
— Pardon?
— I asked the library.
| A．if Li Hong had gone to | B．if had Li Hong gone to |
| C．Li Hong had gone to | D．has Li Hong gone to |
They have made so great progress .
| A．three years ago | B．for three years |
| C．in the past three years | D．before three years |
The earth is years old.
| A．four thousands six hundreds | B．four thousand six hundred |
| C．four thousand and six hundred million | D．four thousand six hundred millions |